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Controllable X-Ray Pulse Trains from Enhanced Self-Amplified Spontaneous Emission

Journal Article · · Physical Review Letters
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  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); SLAC National Accelerator Laboratory (SLAC)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Q-Peak, Inc, Bedford, MA (United States)
  4. Argonne National Lab. (ANL), Lemont, IL (United States)
Here, we report the demonstration of optical compression of an electron beam and the production of controllable trains of femtosecond, soft X-ray pulses with the Linac Coherent Light Source (LCLS) free-electron laser (FEL). This is achieved by enhanced self-amplified spontaneous emission (ESASE) with a 2~ μ m laser and a dechirper device. Optical compression was achieved by modulating the energy of an electron beam with the laser and then compressing with a chicane, resulting in high current spikes on the beam which we observe to lase. A dechirper was then used to selectively control the lasing region of the electron beam. Field autocorrelation measurements indicate a train of pulses, and we find that the number of pulses within the train can be controlled (from 1 to 5 pulses) by varying the dechirper position and undulator taper. These results are a step towards attosecond spectroscopy with X-ray FELs as well as future FEL schemes relying on optical compression of an electron beam.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
AC02-06CH11357; AC02-76SF00515; SC0007749
OSTI ID:
1765002
Alternate ID(s):
OSTI ID: 1811502
OSTI ID: 1774890
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 126; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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